Puzman

Ok truck is a 1997 dodge 2500 turbo diesel. Three days ago the new alt stopped charging, the tack and speedo stopped working, along with the a/c and intake heater system. I rechecked the new batteries, starter, alternator and bell housing (new clutch). Everything seems a ok. With that down I changed the ignition switch which did nothing. I then moved on to the pcm. I swapped the pcm into a clone truck and it worked fine. I then removed the pcm and started the clone truck. It now had all the symptoms of my truck. So the pcm is good but does not work. I checked all the fuses. Found some fuseable links witch tested good. What is the deal? What should I do? Is there a relay pack somewhere I am missing? Is there a diagram of the pcm harness somewhere?

Please please please help me kill this electrical gremlin!!!!!!!!!!!

phox_mulder

Cornfused here.

Your PCM worked in the other truck, or didn't work?
Other trucks PCM worked in your truck, or didn't work.

Alternator, A/C, tach and speedo point to the crank sensor.
If the PCM doesn't think the engine is running, it won't let the alternator charge or the A/C work, and obviously the tach won't work since it doesn't think the engine is running.


phox

ridepayson

Puzzman -- try reading through this thread, might be helpful, https://www.dieseltruckresource.com/...ad.php?t=56565, Or pm infidel, he helped me get my 97 going with similar issues,or here https://www.dieseltruckresource.com/...ad.php?t=62408